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+/****************************************************************************
+**
+** Implementation of QAccessible and QAccessibleObject classes
+**
+** Copyright (C) 2000-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the kernel module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file.  Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qaccessible.h"
+
+#if defined(QT_ACCESSIBILITY_SUPPORT)
+
+#include "qptrdict.h"
+#include "qmetaobject.h"
+#include <private/qpluginmanager_p.h>
+#include "qapplication.h"
+#include <stdlib.h>
+
+/*!
+    \class QAccessible qaccessible.h
+    \brief The QAccessible class provides enums and static functions
+    relating to accessibility.
+
+    \ingroup misc
+
+    Accessibility clients use implementations of the
+    QAccessibleInterface to read the information an accessible object
+    exposes, or to call functions to manipulate the accessible object.
+
+\omit
+    Qt provides implementations of the QAccessibleInterface for most
+    widget classes in a plugin. This plugin is located in the \e
+    accessibility subdirectory of the plugins installation directory.
+    The default installation directory for plugins is \c INSTALL/plugins,
+    where \c INSTALL is the directory where Qt was installed.  Calling
+    queryAccessibleInterface( QObject *object, QAccessibleInterface
+    **iface ) will ask all plugins located in this directory for an
+    implementation that exposes the information for objects of the
+    class of \e object.
+
+    To make a Qt application accessible you have to distribute the
+    accessibility plugin provded with Qt together with your
+    application. Simply add the plugins created in
+    INSTALL/plugins/accessibility to your distribution process. Use \l
+    QApplication::addLibraryPath() to specify a plugin directory for
+    your application, and copy the files into an \e accessibility
+    subdirectory of one of those plugin directories. Qt's
+    accessibility framework will load the plugins upon request and use
+    the implementations provided to expose an object's accessibility
+    information.
+\endomit
+
+    See the \link plugins-howto.html plugin documentation \endlink for
+    more details about how to redistribute Qt plugins.
+*/
+
+/*!
+    \enum QAccessible::State
+
+    This enum type defines bitflags that can be combined to indicate
+    the state of the accessible object. The values are:
+
+    \value Normal
+    \value Unavailable
+    \value Selected
+    \value Focused
+    \value Pressed
+    \value Checked
+    \value Mixed
+    \value ReadOnly
+    \value HotTracked
+    \value Default
+    \value Expanded
+    \value Collapsed
+    \value Busy
+    \value Floating
+    \value Marqueed
+    \value Animated
+    \value Invisible
+    \value Offscreen
+    \value Sizeable
+    \value Moveable
+    \value SelfVoicing
+    \value Focusable
+    \value Selectable
+    \value Linked
+    \value Traversed
+    \value MultiSelectable
+    \value ExtSelectable
+    \value AlertLow
+    \value AlertMedium
+    \value AlertHigh
+    \value Protected
+    \value Valid
+*/
+
+/*!
+    \enum QAccessible::Event
+
+    This enum type defines event types when the state of the
+    accessible object has changed. The event types are:
+
+    \value SoundPlayed
+    \value Alert
+    \value ForegroundChanged
+    \value MenuStart
+    \value MenuEnd
+    \value PopupMenuStart
+    \value PopupMenuEnd
+    \value ContextHelpStart
+    \value ContextHelpEnd
+    \value DragDropStart
+    \value DragDropEnd
+    \value DialogStart
+    \value DialogEnd
+    \value ScrollingStart
+    \value ScrollingEnd
+    \value ObjectCreated
+    \value ObjectDestroyed
+    \value ObjectShow
+    \value ObjectHide
+    \value ObjectReorder
+    \value Focus
+    \value Selection
+    \value SelectionAdd
+    \value SelectionRemove
+    \value SelectionWithin
+    \value StateChanged
+    \value LocationChanged
+    \value NameChanged
+    \value DescriptionChanged
+    \value ValueChanged
+    \value ParentChanged
+    \value HelpChanged
+    \value DefaultActionChanged
+    \value AcceleratorChanged
+    \value MenuCommand
+*/
+
+/*!
+    \enum QAccessible::Role
+
+    This enum defines a number of roles an accessible object can have.
+    The roles are:
+
+    \value NoRole
+    \value TitleBar
+    \value MenuBar
+    \value ScrollBar
+    \value Grip
+    \value Sound
+    \value Cursor
+    \value Caret
+    \value AlertMessage
+    \value Window
+    \value Client
+    \value PopupMenu
+    \value MenuItem
+    \value ToolTip
+    \value Application
+    \value Document
+    \value Pane
+    \value Chart
+    \value Dialog
+    \value Border
+    \value Grouping
+    \value Separator
+    \value ToolBar
+    \value StatusBar
+    \value Table
+    \value ColumnHeader
+    \value RowHeader
+    \value Column
+    \value Row
+    \value Cell
+    \value Link
+    \value HelpBalloon
+    \value Character
+    \value List
+    \value ListItem
+    \value Outline
+    \value OutlineItem
+    \value PageTab
+    \value PropertyPage
+    \value Indicator
+    \value Graphic
+    \value StaticText
+    \value EditableText
+    \value PushButton
+    \value CheckBox
+    \value RadioButton
+    \value ComboBox
+    \value DropLest
+    \value ProgressBar
+    \value Dial
+    \value HotkeyField
+    \value Slider
+    \value SpinBox
+    \value Diagram
+    \value Animation
+    \value Equation
+    \value ButtonDropDown
+    \value ButtonMenu
+    \value ButtonDropGrid
+    \value Whitespace
+    \value PageTabList
+    \value Clock
+*/
+
+/*!
+    \enum QAccessible::NavDirection
+
+    This enum specifies which item to move to when navigating.
+
+    \value NavUp	    sibling above
+    \value NavDown	    sibling below
+    \value NavLeft	    left sibling
+    \value NavRight	    right sibling
+    \value NavNext	    next sibling
+    \value NavPrevious	    previous sibling
+    \value NavFirstChild    first child
+    \value NavLastChild	    last child
+    \value NavFocusChild    child with focus
+*/
+
+/*!
+    \enum QAccessible::Text
+
+    This enum specifies string information that an accessible object
+    returns.
+
+    \value Name		    The name of the object
+    \value Description	    A short text describing the object
+    \value Value	    The value of the object
+    \value Help		    A longer text giving information about how
+			    to use the object
+    \value DefaultAction    The default method to interact with the object
+    \value Accelerator	    The keyboard shortcut that executes the
+			    default action
+*/
+
+/*!
+    \fn static void QAccessible::updateAccessibility( QObject *object, int control, Event reason )
+
+    Notifies accessibility clients about a change in \a object's
+    accessibility information.
+
+    \a reason specifies the cause of the change, for example,
+    ValueChange when the position of a slider has been changed. \a
+    control is the ID of the child element that has changed. When \a
+    control is 0, the object itself has changed.
+
+    Call this function whenever the state of your accessible object or
+    one of it's sub-elements has been changed either programmatically
+    (e.g. by calling QLabel::setText()) or by user interaction.
+
+    If there are no accessibility tools listening to this event, the
+    performance penalty for calling this function is minor, but if determining
+    the parameters of the call is expensive you can use isActive() to
+    avoid unnecessary performance penalties if no client is listening.
+*/
+
+static QPluginManager<QAccessibleFactoryInterface> *qAccessibleManager = 0;
+
+class AccessibleCache : public QObject, public QPtrDict<QAccessibleInterface>
+{
+    Q_OBJECT
+public:
+    AccessibleCache()
+        : QPtrDict<QAccessibleInterface>(73)
+    {
+    }
+
+    void addObject(QObject *object, QAccessibleInterface *iface)
+    {
+        insert(object, iface);
+        connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(removeObject(QObject*)));
+    }
+
+public slots:
+    void removeObject(QObject *object);
+};
+
+#include "qaccessible.moc"
+
+static AccessibleCache *qAccessibleInterface = 0;
+static bool cleanupAdded = FALSE;
+
+static void qAccessibleCleanup()
+{
+    if ( qAccessibleInterface && qAccessibleInterface->count() && qAccessibleManager )
+	qAccessibleManager->setAutoUnload( FALSE );
+
+    delete qAccessibleInterface;
+    qAccessibleInterface = 0;
+    delete qAccessibleManager;
+    qAccessibleManager = 0;
+}
+
+#ifdef Q_WS_MAC
+QObject *QAccessible::queryAccessibleObject(QAccessibleInterface *o)
+{
+    if(qAccessibleInterface) {
+	for(QPtrDictIterator<QAccessibleInterface> it(*qAccessibleInterface); it.current(); ++it) {
+	    if(it.current() == o)
+		return (QObject*)it.currentKey();
+	}
+    }
+    return NULL;
+}
+#endif
+
+void AccessibleCache::removeObject(QObject *object)
+{
+    if (!object)
+        return;
+
+    remove(object);
+    if (!count()) {
+        delete this;
+        qAccessibleInterface = 0;
+    }
+}
+
+
+/*!
+    Sets \a iface to point to the implementation of the
+    QAccessibleInterface for \a object, and returns \c QS_OK if
+    successfull, or sets \a iface to 0 and returns \c QE_NOCOMPONENT if
+    no accessibility implementation for \a object exists.
+
+    The function uses the \link QObject::className() classname
+    \endlink of \a object to find a suitable implementation. If no
+    implementation for the object's class is available the function
+    tries to find an implementation for the object's parent class.
+
+    This function is called to answer an accessibility client's
+    request for object information. You should never need to call this
+    function yourself.
+*/
+QRESULT QAccessible::queryAccessibleInterface( QObject *object, QAccessibleInterface **iface )
+{
+    *iface = 0;
+    if ( !object )
+	return QE_INVALIDARG;
+
+    if ( qAccessibleInterface ) {
+	*iface = qAccessibleInterface->find( object );
+	if ( *iface ) {
+	    (*iface)->addRef();
+	    return QS_OK;
+	}
+    }
+
+    if ( !qAccessibleManager ) {
+	qAccessibleManager = new QPluginManager<QAccessibleFactoryInterface>( IID_QAccessibleFactory, QApplication::libraryPaths(), "/accessible" );
+	if ( !cleanupAdded ) {
+	    qAddPostRoutine( qAccessibleCleanup );
+	    cleanupAdded = TRUE;
+	}
+    }
+
+    QInterfacePtr<QAccessibleFactoryInterface> factory = 0;
+    QMetaObject *mo = object->metaObject();
+    while ( mo ) {
+	qAccessibleManager->queryInterface( mo->className(), &factory );
+	if ( factory )
+	    break;
+	mo = mo->superClass();
+    }
+    if ( factory )
+	return factory->createAccessibleInterface( mo->className(), object, iface );
+
+    return QE_NOCOMPONENT;
+}
+
+/*!
+    Returns TRUE if an accessibility implementation has been requested,
+    during the runtime of the application, otherwise returns FALSE. 
+    
+    Use this function to prevent potentially expensive notifications via
+    updateAccessibility().
+
+    \omit
+    QListView uses this function to prevent index-lookups for item based
+    notifications.
+    \endomit
+*/
+bool QAccessible::isActive()
+{
+    return qAccessibleManager != 0;
+}
+
+/*!
+    \class QAccessibleInterface qaccessible.h
+    \brief The QAccessibleInterface class defines an interface that exposes information about accessible objects.
+
+    \ingroup misc
+*/
+
+/*!
+    \fn bool QAccessibleInterface::isValid() const
+
+    Returns TRUE if all the data necessary to use this interface
+    implementation is valid (e.g. all pointers are non-null),
+    otherwise returns FALSE.
+*/
+
+/*!
+    \fn int QAccessibleInterface::childCount() const
+
+    Returns the number of children that belong to this object. A child
+    can provide accessibility information on it's own (e.g. a child
+    widget), or be a sub-element of this accessible object.
+
+    All objects provide this information.
+
+    \sa queryChild()
+*/
+
+/*!
+    \fn QRESULT QAccessibleInterface::queryChild( int control, QAccessibleInterface **iface ) const
+
+    Sets \a iface to point to the implementation of the
+    QAccessibleInterface for the child specified with \a control. If
+    the child doesn't provide accessibility information on it's own,
+    the value of \a iface is set to 0. For those elements, this
+    object is responsible for exposing the child's properties.
+
+    All objects provide this information.
+
+    \sa childCount(), queryParent()
+*/
+
+/*!
+    \fn QRESULT QAccessibleInterface::queryParent( QAccessibleInterface **iface ) const
+
+    Sets \a iface to point to the implementation of the
+    QAccessibleInterface for the parent object, or to 0 if there is
+    no such implementation or object.
+
+    All objects provide this information.
+
+    \sa queryChild()
+*/
+
+/*!
+    \fn int QAccessibleInterface::controlAt( int x, int y ) const
+
+    Returns the ID of the child that contains the screen coordinates
+    (\a x, \a y). This function returns 0 if the point is positioned
+    on the object itself. If the tested point is outside the
+    boundaries of the object this function returns -1.
+
+    All visual objects provide this information.
+*/
+
+/*!
+    \fn QRect QAccessibleInterface::rect( int control ) const
+
+    Returns the location of the child specified with \a control in
+    screen coordinates. This function returns the location of the
+    object itself if \a control is 0.
+
+    All visual objects provide this information.
+*/
+
+/*!
+    \fn int QAccessibleInterface::navigate( NavDirection direction, int startControl ) const
+
+    This function traverses to another object, or to a sub-element of
+    the current object. \a direction specifies in which direction to
+    navigate, and \a startControl specifies the start point of the
+    navigation, which is either 0 if the navigation starts at the
+    object itself, or an ID of one of the object's sub-elements.
+
+    The function returns the ID of the sub-element located in the \a
+    direction specified. If there is nothing in the navigated \a
+    direction, this function returns -1.
+
+    All objects support navigation.
+*/
+
+/*!
+    \fn QString QAccessibleInterface::text( Text t, int control ) const
+
+    Returns a string property \a t of the child object specified by \a
+    control, or the string property of the object itself if \a control
+    is 0.
+
+    The \e Name is a string used by clients to identify, find or
+    announce an accessible object for the user. All objects must have
+    a name that is unique within their container.
+
+    An accessible object's \e Description provides textual information
+    about an object's visual appearance. The description is primarily
+    used to provide greater context for low-vision or blind users, but
+    is also used for context searching or other applications. Not all
+    objects have a description. An "OK" button would not need a
+    description, but a toolbutton that shows a picture of a smiley
+    would.
+
+    The \e Value of an accessible object represents visual information
+    contained by the object, e.g. the text in a line edit. Usually,
+    the value can be modified by the user. Not all objects have a
+    value, e.g. static text labels don't, and some objects have a
+    state that already is the value, e.g. toggle buttons.
+
+    The \e Help text provides information about the function and
+    usage of an accessible object. Not all objects provide this
+    information.
+
+    An accessible object's \e DefaultAction describes the object's
+    primary method of manipulation, and should be a verb or a short
+    phrase, e.g. "Press" for a button.
+
+    The accelerator is a keyboard shortcut that activates the default
+    action of the object. A keyboard shortcut is the underlined
+    character in the text of a menu, menu item or control, and is
+    either the character itself, or a combination of this character
+    and a modifier key like ALT, CTRL or SHIFT. Command controls like
+    tool buttons also have shortcut keys and usually display them in
+    their tooltip.
+
+    \sa role(), state(), selection()
+*/
+
+/*!
+    \fn void QAccessibleInterface::setText( Text t, int control, const QString &text )
+
+    Sets the text property \a t of the child object \a control to \a
+    text. If \a control is 0, the text property of the object itself
+    is set.
+*/
+
+/*!
+    \fn QAccessible::Role QAccessibleInterface::role( int control ) const
+
+    Returns the role of the object if \a control is 0, or the role of
+    the object's sub-element with ID \a control. The role of an object
+    is usually static. All accessible objects have a role.
+
+    \sa text(), state(), selection()
+*/
+
+/*!
+    \fn QAccessible::State QAccessibleInterface::state( int control ) const
+
+    Returns the current state of the object if \a control is 0, or the
+    state of the object's sub-element element with ID \a control. All
+    objects have a state.
+
+    \sa text(), role(), selection()
+*/
+
+/*!
+    \fn QMemArray<int> QAccessibleInterface::selection() const
+
+    Returns the list of all the element IDs that are selected.
+
+    \sa text(), role(), state()
+*/
+
+/*!
+    \fn bool QAccessibleInterface::doDefaultAction( int control )
+
+    Calling this function performs the default action of the child
+    object specified by \a control, or the default action of the
+    object itself if \a control is 0.
+*/
+
+/*!
+    \fn bool QAccessibleInterface::setFocus( int control )
+
+    Gives the focus to the child object specified by \a control, or to
+    the object itself if \a control is 0.
+
+    Returns TRUE if the focus could be set; otherwise returns FALSE.
+*/
+
+/*!
+    \fn bool QAccessibleInterface::setSelected( int control, bool on, bool extend )
+
+    Sets the selection of the child object with ID \a control to \a
+    on. If \a extend is TRUE, all child elements between the focused
+    item and the specified child object have their selection set to \a
+    on.
+
+    Returns TRUE if the selection could be set; otherwise returns
+    FALSE.
+
+    \sa setFocus(), clearSelection()
+*/
+
+/*!
+    \fn void QAccessibleInterface::clearSelection()
+
+    Removes any selection from the object.
+
+    \sa setSelected()
+*/
+
+
+
+/*!
+    \class QAccessibleObject qaccessible.h
+    \brief The QAccessibleObject class implements parts of the
+    QAccessibleInterface for QObjects.
+
+    \ingroup misc
+
+    This class is mainly provided for convenience. All subclasses of
+    the QAccessibleInterface should use this class as the base class.
+*/
+
+/*!
+    Creates a QAccessibleObject for \a object.
+*/
+QAccessibleObject::QAccessibleObject( QObject *object )
+: object_(object)
+{
+    if ( !qAccessibleInterface ) {
+	qAccessibleInterface = new AccessibleCache;
+	if ( !cleanupAdded ) {
+	    qAddPostRoutine( qAccessibleCleanup );
+	    cleanupAdded = TRUE;
+	}
+    }
+
+    qAccessibleInterface->addObject(object, this);
+}
+
+/*!
+    Destroys the QAccessibleObject.
+
+    This only happens when a call to release() decrements the internal
+    reference counter to zero.
+*/
+QAccessibleObject::~QAccessibleObject()
+{
+    if ( qAccessibleInterface ) {
+	qAccessibleInterface->removeObject(object_);
+	if ( !qAccessibleInterface->count() ) {
+	    delete qAccessibleInterface;
+	    qAccessibleInterface = 0;
+	}
+    }
+}
+
+/*!
+    \reimp
+*/
+QRESULT QAccessibleObject::queryInterface( const QUuid &uuid, QUnknownInterface **iface )
+{
+    *iface = 0;
+    if ( uuid == IID_QAccessible )
+	*iface = (QAccessibleInterface*)this;
+    else if ( uuid == IID_QUnknown )
+	*iface = (QUnknownInterface*)this;
+    else
+	return QE_NOINTERFACE;
+
+    (*iface)->addRef();
+    return QS_OK;
+}
+
+/*!
+    Returns the QObject for which this QAccessibleInterface
+    implementation provides information. Use isValid() to make sure
+    the object pointer is safe to use.
+*/
+QObject *QAccessibleObject::object() const
+{
+#if defined(QT_CHECK_RANGE)
+    if ( !isValid() )
+	qWarning( "QAccessibleInterface is invalid. Crash pending..." );
+#endif
+    return object_;
+}
+
+/*!
+    \reimp
+*/
+bool QAccessibleObject::isValid() const
+{
+    return !object_.isNull();
+}
+
+#endif